Fuel saver



May 15, 1934. J. A. NELSON El AL FUEL SAVER Filed Feb. 24 1932 Patented May 15, 1934 UNITED STATES PATENT OFFICE ZClaims.

This invention relates to circulating heaters or stoves, and attachments for the same, of a nature to cause the products of combustion to travel through circuitous paths in a manner resulting in a marked increase in efliciency, and with a consequent saving in fuel.

The invention is susceptible of application in a number of different ways, as will be clear from an inspection of the accompanyin drawing wherein Figure 1 is a transverse vertical section of one form of attachment for a heater or stove.

Figure 2 is a rear elevation with a part in section of another form of attachment.

Figure 3 is a fore and aft vertical sectional view through a heater or stove showing another form of attachment applied thereto, and

Figure 4 is a transverse vertical section upon line 4-4 of Figure 3.

Like numerals designate corresponding parts in all the figures of the drawing.

Referring to the drawing, and particularly to Figs. 3 and 4, the numeral 5 designates the casing instance, pivoted at one side of its centei of a circulating heater, 6 the dome, and 7 the ashpit; these parts being all of a conventionalform. In this form 'of the invention, I attach to the rear of the heater, and as a part thereof within the casing 5, the structure illustrated in Fig. 4, where 8 designates the outlet opening from the dome 6 that leads into the interior of a central vertical conduit 9.

The products of combustion may pass directly from this conduit to the outlet flue 10 if the damper 11 be opened, but if this damper is closed, then the travel of the products of combustion must be in the direction indicated by'the arrows, first downwardly through conduit 9 and then upwardly through outer conduits 12 and 13,

finally reaching the outlet 10 bypassing over the" top of the damper 11. I I

It will be noted that'the damper is, in each these dampers are adapted to yield toward open position in the event of any explosion of gas in the furnace. This is of importance because of the rapidly increasing use of oil burners where minor explosions are of frequent occurrence.

In the form of the invention illustrated in Figs. 1 and 2, we have shown structures made of stove pipe and adapted to be used as an attachment for known types of heaters.-

In the form of the invention illustrated in Fig. 1, a conduit 14, shaped as shown, has one of its ends 15 in communication with a smoke pipe 16, and its other end 17 in communication with said conduit 14.

Thus,

smoke pipe by a T-pipe section 18 which is provided with a damper 19in its length. The central conduit 20 of the -T is adapted to be attached to the outlet opening of the stove corresponding to the opening8 in Fig.8, and if the damper 19 be opened the products of combustion will pass in the direction indicated by the arrows Z or directly from the conduit 20 to the smoke pipe 16, but if g the damper be closed then the travel of the products of combustion must be in the direction of the arrows X or all the way around the length of the through such tortuous paths. However, we. are not aware that it has ever heretofore been proposed to accomplish this result in the simple and very eflicient way illustrated and described.

Note that in Fig. 2 the products of combustion areturned directly into a. vertical conduit, and so the initial movement of these products is downwardly so that this influence is under the action of the draft but in opposition to the natural tendency of heated air to rise. Thus, the prod-. ucts of combustion have time to part with a considerable measure of their heat before starting to rise in the conduits 21 and 22, and equivalent parts of the remaining figures of the drawing. I This results in a very high degree of efliciency and results in a very considerable saving in fuel.

. .It is to be understood that the invention is not limited to the precise arrangement set forth but that it includes within its purview whatever changes fairly come within the terms or the spirit of the appended claims. Having described our invetnion, what we claim,

1. The combination with a heater comprising a substantially horizontal smoke outlet, of a vertically disposed pipestructure comprising a centrally arranged vertical pipe having a lateral inlet opening therein that is in communication with the smoke outlet of the said furnace, a pair of substantially straight pipes one upon each side of said centrally arranged pipe, a T section at the lower end of the centrally arranged pipe section, a second T section adjacent the upper end of the centrally arranged pipe and above the lateral inlet opening, a vertical outlet pipe leading from the top of the last named T section and in substantial alignment with said centrally arranged pipe section, a damper in the centrally arranged vertical pipe at a point between the lateral inlet opening and the uppermost T section, said damper being pivoted at one side of its center to adapt it to lift under the influence of excessive gas pressure therebelow, the pair of substantially straight pipes one upon each side of said centrally arranged pipe, having their upper and lower ends connected to the upper and lower T sections, respectively, of the centrally arranged vertical pipe.

2. The combination with a heater comprising a substantially horizontal smoke pipe leading therefrom, of a heat radiating structure vertically disposed with respect to the heater, said heat radiating structure comprising a pipe section into the side, of which said smoke pipe discharges, an

outlet chimney pipe disposed in proximity to the point of entry of the said smoke pipe of the heater, a damper between the chimney pipe and the said smoke pipe, and a pipe structure constituting a greatly elongated path for the products of'combustion, leading away from the damper and the first named pipe section and upon the opposite side of the smoke pipe from the damper and providing a path for the products of combustion from the smoke pipe of the heater to the chimney pipe and connecting with the chimney pipe upon the opposite side of the damper from the point of entry of the smoke pipe into the first named pipe section, said damper being mounted to adapt it to open automatically toward the chimney pipe, under the influence of excessive gas pressures in the heater.

JOHN A. NELSON. CARRIE NELSON.

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